Disagree. A 4 popper with a leaf sprung rig won't bust many shafts. I went 3 years with a 4.2 and 5 years with a 383 v8 and never busted a 35 shaft. Broke a few 30's though. Running 33's and then 35's.

x2
I ran a leaf sprung YJ D35 with a pretty stout SBC and 35's for a good couple years. When I finally blew it up, I was beating the shit out of it on a hill and exploded the center section. Shafts were still good.